We did not know why they ------leave A had B had to C must Dmight_英语解答

We did not know why they ------leave A had B had to C must Dmight

人气：211 ℃　时间：2020-03-25 02:31:13

解答

B had to 不得不离开的原因
must 表100%的肯定,和why连用不合适